Ramp up - Add tests for Products Delete API (facebook#2865)

Summary:
### Changes proposed in this Pull Request:
- Adding simple Request and Response tests to the Products Delete API to increase code coverage and as a ramp-up work item for getting used to the dev flow in this repository

- [x] Do the changed files pass `phpcs` checks? Please remove `phpcs:ignore` comments in changed files and fix any issues, or delete if not practical.

Pull Request resolved: facebook#2865

Test Plan: - `phpunit tests/Unit/Api/ProductCatalog/Products/Delete`

Reviewed By: jczhuoMeta, vinkmeta

Differential Revision: D68915742

Pulled By: carterbuce

fbshipit-source-id: d7fb475ccc1f0c24632e8579d56feb5cb4bc54d2

tests/Unit/Api/ProductCatalog/Products/Delete/RequestTest.php

@@ -0,0 +1,26 @@
+<?php
+
+declare( strict_types=1 );
+
+namespace Api\ProductCatalog\Products\Delete;
+
+use WooCommerce;
+use WP_UnitTestCase;
+
+/**
+ * Test cases for product delete API request
+ */
+class RequestTest extends WP_UnitTestCase {
+	/**
+	 * Tests request endpoint config
+	 *
+	 * @return void
+	 */
+	public function test_request() {
+		$product_group_id = 'facebook-product-group-id';
+		$request          = new WooCommerce\Facebook\API\ProductCatalog\Products\Delete\Request( $product_group_id );
+
+		$this->assertEquals( 'DELETE', $request->get_method() );
+		$this->assertEquals( '/facebook-product-group-id', $request->get_path() );
+	}
+}

tests/Unit/Api/ProductCatalog/Products/Delete/ResponseTest.php

@@ -0,0 +1,25 @@
+<?php
+
+declare( strict_types=1 );
+
+namespace Api\ProductCatalog\Products\Delete;
+
+use WooCommerce;
+use WP_UnitTestCase;
+
+/**
+ * Test cases for product delete API response
+ */
+class ResponseTest extends WP_UnitTestCase {
+	/**
+	 * Tests response value
+	 *
+	 * @return void
+	 */
+	public function test_response() {
+		$json     = '{"success":true}';
+		$response = new WooCommerce\Facebook\API\ProductCatalog\Products\Delete\Response( $json );
+
+		$this->assertTrue( $response->success );
+	}
+}